如何在jTable（自動保存）中編輯後從單元格中保存數據？

Question

我有一個JTable，它是從矢量中填充數據的，我希望它在編輯數據後在數據庫中自動保存。

  Vector columnNames = new Vector(); 
      Vector data = new Vector(); 

      Connection conn = dbConnect.connect(); 
      String sql = "Select date, frequency, type, payeereceivee, amount, comments from schedule where date ='" + outputdate + "'"; 
      Statement statement = conn.createStatement(); 
      ResultSet resultSet = statement.executeQuery(sql); 
      ResultSetMetaData metaData = resultSet.getMetaData(); 
      int columns = metaData.getColumnCount(); 
      for (int i = 1; i <= columns; i++) { 
       columnNames.addElement(metaData.getColumnName(i)); 
      } 
      while (resultSet.next()) { 
       Vector row = new Vector(columns); 
       for (int i = 1; i <= columns; i++) { 
        row.addElement(resultSet.getObject(i)); 
       } 
       data.addElement(row); 
      } 
      resultSet.close(); 
      statement.close(); 

      tbl = new JTable(data, columnNames); 
      TableColumn column; 
      for (int i = 0; i < tbl.getColumnCount(); i++) { 
       column = tbl.getColumnModel().getColumn(i); 
       column.setMaxWidth(250); 
      } 

Answer 1

什麼是上述評論的意思是創建自己的TableModel（例如通過將DefaultTableModel），並覆蓋/實施setValueAt來更新數據庫。

請參閱下面的代碼片段。確保在EDT上不執行數據庫更新（事件分派線程，如果您不知道它是什麼，請檢查「Swing中的併發」），例如使用SwingWorker。

import java.awt.BorderLayout; 
import java.sql.Connection; 
import java.sql.ResultSet; 
import java.sql.ResultSetMetaData; 
import java.sql.Statement; 
import java.util.Vector; 

import javax.swing.JFrame; 
import javax.swing.JScrollPane; 
import javax.swing.JTable; 
import javax.swing.SwingUtilities; 
import javax.swing.UIManager; 
import javax.swing.UnsupportedLookAndFeelException; 
import javax.swing.table.DefaultTableModel; 
import javax.swing.table.TableColumn; 

public class TestTable2 { 

    protected void initUI() { 
     Vector<String> columnNames = new Vector<String>(); 
     Vector<Vector<Object>> data = new Vector<Vector<Object>>(); 

     Connection conn = dbConnect.connect(); 
     String sql = "Select date, frequency, type, payeereceivee, amount, comments from schedule where date ='" + outputdate + "'"; 
     Statement statement = conn.createStatement(); 
     ResultSet resultSet = statement.executeQuery(sql); 
     ResultSetMetaData metaData = resultSet.getMetaData(); 
     int columns = metaData.getColumnCount(); 
     for (int i = 1; i <= columns; i++) { 
      columnNames.addElement(metaData.getColumnName(i)); 
     } 
     while (resultSet.next()) { 
      Vector row = new Vector(columns); 
      for (int i = 1; i <= columns; i++) { 
       row.addElement(resultSet.getObject(i)); 
      } 
      data.addElement(row); 
     } 
     resultSet.close(); 
     statement.close(); 

     JTable tbl = new JTable(new DefaultTableModel(data, columnNames) { 
      @Override 
      public void setValueAt(Object aValue, int row, int column) { 
       // Here update DB with a SwingWorker and the new provided value 
       super.setValueAt(aValue, row, column); 
      } 
     }); 
     TableColumn column; 
     for (int i = 0; i < tbl.getColumnCount(); i++) { 
      column = tbl.getColumnModel().getColumn(i); 
      column.setMaxWidth(250); 
     } 
     JFrame frame = new JFrame(TestTable2.class.getSimpleName()); 
     frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     JScrollPane scrollpane = new JScrollPane(tbl); 
     frame.add(scrollpane, BorderLayout.CENTER); 
     frame.pack(); 
     frame.setVisible(true); 
    } 

    public static void main(String[] args) throws ClassNotFoundException, InstantiationException, IllegalAccessException, 
      UnsupportedLookAndFeelException { 
     UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName()); 
     SwingUtilities.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       new TestTable2().initUI(); 
      } 
     }); 
    } 

}